One injection current in insulator
has been studied widely for a long time in various geometries. An important
field for study is the analytical treatment of current carriers in deep trap
region well below the fermi level. In the present problem, a cylindrical
structure has been taken into consideration. The effects of traps are included
in the analysis. The problem becomes complicated in the presence of traps and
thermal free carriers because there are various transitions regimes present in
the complete current-voltage characteristics.

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